On 12/03/2016 09:32 PM, Andrea Bolandrina wrote:
What problems does rdiff-backup have with hard linked content?
As far as I know hard links should be supported...
Supported? Yes, but with plenty of bugs. If links are added and
removed from a set, you can end up with two or more separate subsets
(i.e., what should be a set of 10 links to a single file becomes 3 files
with link counts of 3, 5, and 2), and the link arrangement in the
metadata files won't always match the link arrangement in the mirror.
The checksum is stored only for the first link in the collating
sequence. If that first link gets deleted, the checksum is lost. If a
link with a path that comes earlier in the collating sequence is added,
it sometimes does not inherit the checksum. I have a massive and
time-consuming audit that I run after every backup session to patch that
up.
Verification always complains about missing checksums for all the links
that do no have one stored. I have to filter out all the verbose 2-line
messages for those from the verification report.